JP2001060359A - Optical disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk recording and reproducing device configured to record a signal onto a disk by using a laser beam emitted from an optical pickup. SOLUTION: In the optical disk recording and reproducing device configured to record a signal onto a disk 1 at plural high speeds set to the specified speed and the several fold higher speed thereto and also by reading the data signal stored once in a RAM 10 for buffering, when signal recording operation to the disk 1 is interrupted due to lack of capacity for the data signal to be stored in the RAM 10 for buffering during the recording operation of the data signal onto the disk 1 at the high speeds, the device detects a data amount buffered by the RAM 10 for buffering, and changes the setting of the rotational speed of the disk 1 based on the detected data amount to re-start the recording operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording / reproducing apparatus configured to record a signal on a disk by a laser radiated from an optical pickup and to reproduce a signal recorded on the disk by the laser. About.

[0002]

2. Description of the Related Art Disk players which read signals recorded on a disk using an optical pickup have become widespread, but recently, in addition to a reproducing function, a disk irradiated by a laser emitted from the optical pickup has been used. An optical disk recording / reproducing apparatus configured to record a signal on the optical disk has been commercialized.

[0003] Recently, for a specified linear velocity,
An optical disk recording / reproducing apparatus configured to be able to record a signal while controlling the rotation of the disk at a constant high linear velocity of 2 times, 4 times, 6 times, 8 times, 10 times, and 12 times. Is being developed.

[0004]

The optical disk recording / reproducing apparatus is configured to perform a signal recording operation in accordance with a recording command from a computer device serving as a host. Is temporarily stored in a buffer RAM, and a signal stored in the buffer RAM is read to perform a signal recording operation on a disk.

In a state where the signal recording operation to the disk is performed normally, the recording signal output from the computer device is written to the buffer RAM, the signal is read from the buffer RAM, and the signal is read. The recording operation of the output signal on the disk is performed according to the amount of the recording signal and the recording state on the disk.

Further, when a signal recording operation on a disk is performed at a speed several times higher than a prescribed speed, the amount of a signal to be written is insufficient for the amount of a signal read from a buffer RAM. In such a case,
An operation of interrupting the operation of recording the signal on the disk and restarting the operation of recording the signal on the disk when the amount of the signal stored in the buffer RAM reaches a predetermined amount is performed. According to such a configuration, even if the amount of signals stored in the buffer RAM is insufficient, the processing operation can be performed. However, when a large-capacity signal is to be recorded, the above-described recording interruption and recording restart The operation will be repeated frequently. As a result, there is a problem that the recording time becomes long despite the high-speed recording operation.

An object of the present invention is to provide an optical disk recording / reproducing apparatus which can solve such a problem.

[0008]

SUMMARY OF THE INVENTION The present invention reads out a data signal once stored in a buffer RAM at a prescribed speed and at a plurality of high speeds set to be several times the prescribed speed. An optical disc recording / reproducing apparatus configured to record the signal on a disc by
When the recording operation of the data signal to the disk is performed at a high speed, when the signal recording operation to the disk is interrupted due to the shortage of the capacity of the data signal stored in the buffer RAM, the buffer RAM is used. The amount of buffered data is detected, the rotation speed of the disk is changed and set based on the detected amount of data, and the recording operation is restarted.

[0009]

FIG. 1 is a block circuit diagram showing an embodiment of an optical disk recording / reproducing apparatus according to the present invention. In FIG. 1, reference numeral 1 denotes a disk mounted on a turntable (not shown) driven to rotate by a spindle motor (not shown), and is configured to be driven to rotate by rotation of the turntable. . Also. Position information data is recorded on the disc 1 by a groove called a wobble, and a signal recording / reproducing operation is performed based on a wobble signal obtained from the groove. Reference numeral 2 denotes a laser diode for irradiating the disk 1 with a light beam and a monitoring diode for monitoring light emitted from the laser diode, and a photodetector for receiving the light beam reflected from the signal surface of the disk 1. This is an optical pickup incorporated therein, and is configured to be moved in the radial direction of the disc 1 by a pickup feed motor (not shown).

Reference numeral 3 denotes an RF signal amplification circuit for amplifying an RF signal obtained from a photodetector incorporated in the optical pickup 2 and shaping the waveform, and 4 denotes a signal obtained through the RF signal amplification circuit 3. A pickup control circuit for performing focusing control for focusing a light beam of the optical pickup 2 on a signal surface of the disk 1 and tracking control for following the light beam to a signal track on the signal surface based on the focus servo circuit and A tracking servo circuit is incorporated.

Reference numeral 5 denotes a digital signal processing circuit which performs digital signal processing of signals output from the RF signal amplifier circuit 3 and performs demodulation operations of various signals, and 6 denotes a digital signal processed by the digital signal processing circuit 5. A signal reproducing circuit to which a signal is input. When the information recorded on the disc 1 is an audio signal, the signal is converted into an analog signal and then output to an amplifier or the like, and when the data signal is data such as computer software. Has the function of outputting the digital signal as it is to the computer device 7 provided as a host.

Reference numeral 8 denotes a system control circuit which receives a signal demodulated by the digital signal processing circuit 5 and performs various control operations in accordance with a command signal output from the computer device 7. Numeral 9 receives a recording signal such as a test signal or a data signal, and controls a laser irradiation operation by a laser driving circuit (not shown) in accordance with the signal to record a data signal or the like on the disk 1. This is a signal recording circuit.

Reference numeral 10 denotes a buffer RAM in which a data signal recorded on the disk 1 is temporarily stored, in which a data signal output from the computer device 7 is written and a signal storage operation is performed by a control operation of the system control circuit 8. And the read operation is controlled. The signal stored in the buffer RAM 10 is in a state of being stored and held even after being read for recording on the disk 1, and a new data signal output from the computer device 7 is stored at that position. The data is sequentially overwritten and erased.

Reference numeral 11 denotes a spindle motor drive circuit whose operation is controlled by the system control circuit 8, which has an operation of controlling the rotation of a spindle motor for driving the disk 1 to rotate. The rotational drive control operation is performed not only at the specified linear velocity but also at the specified speed 2
It is configured to be able to rotate at a constant high linear velocity such as 2 ×, 4 ×, 6 ×, 8 ×, and 12 ×.

In such a configuration, during a signal recording operation on the disk 1, a data signal output from the computer device 7 is stored in the buffer RAM 10, and by controlling a reading operation of the stored signal, The signal recording operation on the disk 1 is controlled. When the recording operation of the data signal on the disk 1 is interrupted and the recording operation is restarted, the signal stored in the buffer RAM 10 and the signal recorded on the disk 1 before the interruption are resumed. Is performed so that the signal is recorded continuously to the signal recorded before the interruption, that is, the data signal is recorded in a method called seamless.

Further, in such a configuration, when the data signal recording operation is performed at a high speed, for example, 12 times the specified speed, instead of the specified speed, the data signal written to the buffer RAM 10 is not changed. When the amount is insufficient, the recording operation on the disk 1 is interrupted, and when the amount of the signal written in the buffer RAM 10 exceeds a predetermined amount, the operation of recording the signal on the disk 1 is restarted. . When the recording operation is interrupted due to a shortage of the signal written in the buffer RAM 10, the buffer RAM 10
The operation of detecting the amount of data buffered by the disk 10, ie, the amount of data recorded on the disk 1 from the start of recording until the recording operation is interrupted, is performed, and the rotational speed of the disk 1 is determined based on the detected amount of data. Is set to change to a lower speed.

As described above, the optical disk recording / reproducing apparatus according to the present invention is configured. Next, the reproducing operation in the circuit configured as described above will be described. When a command signal for performing a reproducing operation is output from the computer device 7 to the system control circuit 8 constituting the disk drive device, a control operation for the reproducing operation by the system control circuit 8 is started. When such a reproducing operation is performed, the laser diode incorporated in the optical pickup 2 is supplied with a driving current for obtaining a laser output for performing a signal reading operation from a laser driving circuit. Is set.

When the control operation for such a reproduction operation is started, the rotation control operation of the spindle motor is performed by the spindle motor drive circuit 11. The rotation control operation of the spindle motor decodes the wobble signal. The disk 1 is driven to rotate at a constant linear velocity by comparing the synchronization signal obtained as described above with a reference signal output from a reference signal generation circuit (not shown). Such a control operation is similarly performed at the time of a signal recording operation described later.

The rotation control operation of the spindle motor is performed as described above. In the optical pickup 2 which performs a signal readout operation, the focusing control operation and the tracking control operation are started and the optical pickup 2 is started.
, The reading operation of the signal from the disc 1 is started. Before the reproducing operation, the reading operation of the TOC data recorded in the lead-in area constituting the first session of the disc 1 is performed.

The reading and reproducing operation of the signal recorded in the signal recording area of the first session of the disc 1 is performed based on the TOC data recorded in the lead-in area. The signal read by the optical pickup 2 is amplified and shaped by an RF signal amplifying circuit 3 and then input to a digital signal processing circuit 5 where the signal is demodulated. When signal processing is performed by the digital signal processing circuit 5 to extract information data, the information data is applied to a signal reproduction circuit 6 after signal processing such as error correction is performed.

When the information data read from the disc 1 is an audio signal, the signal reproducing circuit 6 converts the information data into an analog signal and outputs the analog signal to an amplifier or the like. In this case, the digital signal is output to the computer 7 as it is.

As described above, the reproducing operation in the present embodiment is performed. Next, the operation of recording a signal on the disk 1 will be described.

The operation of recording a signal on the disk 1 is as follows. First, a test signal is recorded in a test writing area provided on the disk 1, and then the recorded signal is reproduced to obtain an optimum laser output for the recording operation. The obtained drive current is set to be supplied to the laser diode. When such a laser output setting operation is performed, the disc 1
An operation of reading information data recorded in an area called a buffer, that is, position information of a signal recorded in a signal recording area is performed.

Based on the information data read in this manner, whether a data signal recording operation can be performed in a signal recording area provided on the disk 1 and the position at which the recording operation is performed are determined. A recognition operation is performed.

When the recognition processing operation is completed, the optical pickup 2 is moved to the position where the recording operation on the disk 1 is started, and the operation of writing the recording signal to the buffer RAM 10 is performed. RA for the buffer
When the operation of writing a signal to M10 is performed, the storage amount of the signal stored in the buffer RAM 10 gradually increases. When the storage amount exceeds a predetermined amount, the signal stored in the buffer RAM 10 is read, and the read signal is input to the signal recording circuit 9. As a result, a control operation of the laser drive circuit by the signal recording circuit 9 is performed, and a signal such as data is recorded on the disk 1.

By such an operation, a signal recording operation to the disk 1 is performed, but a signal writing operation to the buffer RAM 10 is performed according to a signal reading operation from the buffer RAM 10. Have been. In the state where the recording operation is normally performed,
Every time a signal is recorded on the disk 1, an address indicating the position, that is, an end address is stored in a memory circuit provided in the system control circuit 8.

When the operation of recording the signal on the disk 1 is interrupted, the operation of reading the signal from the buffer RAM 10 is interrupted. In this case, the writing of the signal to the buffer RAM 10 is performed. The operation is also interrupted. When an operation of starting a signal recording operation on the disc 1 is performed from such a state, the optical pickup 2 is displaced to a position where the recording operation is started, that is, a position where the optical pickup 2 is retracted from a position where the recording operation is interrupted.
The reproduction operation is performed from that position. The position where the recording is interrupted can be easily recognized from the final address stored in the memory circuit every time a normal recording operation is performed, and the optical pickup 2 can be moved to a desired position.

The signal reproduced by such a reproducing operation is a signal recorded immediately before the recording operation is interrupted, and a comparison operation between the signal and the signal stored in the buffer RAM 10 is performed. If it is determined by the comparison operation that the two signals are the same signal, the reading of the signal stored in the buffer RAM 10 and subsequently to the signal subjected to the comparison operation is performed. The operation is performed and the signal is input to the signal recording circuit 9 to start the signal recording operation on the disk 1. By the above-described operation, the operation of interrupting the recording of the signal on the disk 1 and the operation of resuming the recording can be performed. By performing such an operation, the signal is continuously written on the disk 1 despite the interruption of the recording operation. A recording operation, that is, a so-called seamless recording operation can be performed.

As described above, the signal recording operation in this embodiment is performed. Next, the signal recording operation on the disk 1 is performed not at the specified speed but at a rotation speed 12 times the specified speed. The operation when the amount of the data signal stored in the buffer RAM 10 is insufficient during the recording operation will be described.

Such a situation occurs when the amount of the signal output from the computer device 7 to the buffer RAM 10 and written therein is smaller than the amount of the signal read from the buffer RAM 10, but such a phenomenon occurs in the computer device 7. This is caused by a delay in the processing operation.

If a signal cannot be recorded on the disk 1 due to a shortage of signals stored in the buffer RAM 10 while a signal is being recorded at a high rotation speed, the computer The operation of the system control circuit 8 based on the signal output from the device 7 causes a processing operation for interrupting the recording operation of the signal on the disk 1 to be performed. Further, when a processing operation for interrupting the recording operation of the signal to the disk 1 is performed, the operation of writing the signal to the buffer RAM 10 also stops. The stored signal is stored and held. The memory circuit incorporated in the system control circuit 8 is in a state where the final address is stored.

When the signal recording operation on the disk 1 cannot be performed, the above-described processing operation is performed. However, the system control circuit 8 sets the rotational speed of the disk 1 to the lower rotational speed. For example, a processing operation for changing the rotation speed to six times and restarting the signal recording operation on the disk 1 is performed. By such a processing operation, the disk 1
In a situation where a signal can be recorded on the optical pickup 2, the position where the optical pickup 2 starts the recording operation from the last address stored in the memory circuit, that is, the buffer R
After the recording operation is displaced from the position where the recording operation was interrupted due to the lack of the signal amount stored in the AM 10 to a position retracted,
The reproduction operation is performed from that position.

The signal reproduced by the reproducing operation is a signal recorded immediately before the recording operation is interrupted, and a comparison operation between the signal and the signal stored in the buffer RAM 10 is performed. If it is determined by the comparison operation that the two signals are the same signal, the reading of the signal stored in the buffer RAM 10 and subsequently to the signal subjected to the comparison operation is performed. The operation is performed and the signal is input to the signal recording circuit 9 to start the signal recording operation on the disk 1. By the above-described operation, the recording interruption operation and the recording resuming operation of the signal on the disk 1 can be performed, and by performing such operations, the signal is continuously recorded on the disk 1 despite the interruption of the recording operation. A recording operation, that is, a so-called seamless recording operation can be performed.

As described above, when the recording operation is performed at a rotation speed of 12 times the prescribed speed and the recording operation is interrupted due to a shortage of the data signal to be written in the buffer RAM 10, the recording operation is increased by 6 times. An operation of changing the rotation speed is performed to restart the recording operation. Next, a rotation speed change setting operation, which is the gist of the present invention, will be described.

If the writing speed of the data signal output from the computer device 7 to the buffer RAM 10, that is, the transfer speed of the data signal is higher than the recording speed of the disk 1, the data signal written to the buffer RAM 10 becomes insufficient. Therefore, the signal recording operation on the disk 1 is not interrupted. When a recording operation of a data signal is performed at a rotation speed of, for example, 12 times as high as the rotation speed of the disk 1 with respect to a specified speed, the buffer RA of the data signal output from the computer device 7 is used.
If the transfer speed to the M10 is lower than the recording speed to the disk 1, the amount of the data signal written to the buffer RAM 10 becomes insufficient, and the operation of recording the signal to the disk 1 is interrupted.

When the amount of data signals written to the buffer RAM 10 is insufficient, the operation of recording signals on the disk 1 is interrupted. At this time, the amount of data stored in the buffer RAM 10, that is, the buffered data RAM 10 for buffering a data signal output from the computer 7 based on the detected amount.
The optimal rotation speed of the disk 1 can be selected for the transfer speed to the disk 1. For example, if the detected data amount is A when the transfer speed is twice, the buffered data amount is 2A when the transfer speed is four times, and
In the case of six times, the data amount is 3A, and in the case of eight times, the data amount is 4A.

Therefore, if the rotation speed of the disk 1 is changed and set in accordance with the detected amount of buffering data, the data signal output from the computer device 7 is optimized for the transfer speed to the buffer RAM 10. It is possible to select a proper rotation speed of the disk 1. In the above description of the operation, the operation of changing from the state of the recording operation with the rotation speed of 12 times to the state of performing the recording operation with the rotation speed of 6 times is performed by detecting that the data amount of the buffering is 3A. It is a thing.

In this embodiment, the case where the recording operation is performed at the maximum rotational speed of the disk 1 provided in the optical disk recording / reproducing apparatus has been described. However, the same operation is performed during the recording operation at another high rotational speed. You can do it. When the first recording operation is performed at the maximum rotation speed of the disk 1 provided in the optical disk recording / reproducing apparatus,
The change setting operation of the rotation speed corresponding to the transfer speed can be performed efficiently.

[0039]

According to the present invention, the disk is read out at a specified speed and at a plurality of high speeds which are several times higher than the specified speed and by reading out the data signal once stored in the buffer RAM. In an optical disk recording / reproducing apparatus configured to record the signal, when a recording operation of a data signal to the disk is performed at a high speed, the data signal to the disk is insufficient due to a shortage of the data signal stored in the buffer RAM. When the signal recording operation is interrupted, the amount of data buffered in the buffer RAM is detected, and the rotation speed of the disk is changed and set based on the detected amount of data. Can be changed so as to have a rotation speed corresponding to the transfer speed of the data signal written in the RAM for the buffer. Situation leading to capacity shortage of the signal stored to M is reduced, it is possible to reduce the number interruption of the recording operation.

In the present invention, since the first recording operation is started at the maximum rotation speed, the operation of changing and setting the rotation speed of the disk so as to correspond to the transfer speed of the data signal is quickly performed. I can do it.

The present invention detects the amount of data buffered in the buffer RAM each time the signal recording operation on the disk is interrupted due to insufficient capacity of the data signal stored in the buffer RAM, Since the rotation speed of the disk is changed and set based on the detected data amount, the number of times the recording operation is interrupted due to insufficient data signal capacity can be reduced.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram showing an embodiment of an optical disk recording / reproducing apparatus according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 disc 2 optical pickup 4 pickup control circuit 5 digital signal processing circuit 7 computer device 8 system control circuit 10 buffer RAM 11 spindle motor drive circuit

Claims (3)

[Claims] An R speed for a buffer at a predetermined speed and at a plurality of high speeds set several times higher than the predetermined speed, and
In an optical disc recording / reproducing apparatus configured to record a data signal on a disc by reading a data signal once stored in the AM, when the operation of recording a data signal on the disc is performed at a high speed, the buffer When the signal recording operation on the disk is interrupted due to lack of capacity of the data signal stored in the RAM for buffering, the amount of data buffered in the buffer RAM is detected, and based on the detected amount of data, An optical disk recording / reproducing apparatus characterized in that the rotation speed of the optical disk is changed and set, and the recording operation is restarted. 2. The optical disk recording / reproducing apparatus according to claim 1, wherein the first recording operation is started at a maximum rotation speed. 3. An amount of data buffered in the buffer RAM is detected each time the signal recording operation on the disk is interrupted due to a shortage of the capacity of the data signal stored in the buffer RAM. 2. The optical disk recording / reproducing apparatus according to claim 1, wherein the rotation speed of the disk is changed and set based on the data amount.